HD 202206 b
A temperate gas giant world orbiting HD 202206, a G2 V star, 150 ly from Earth. One of 2 charted worlds in its system.
The light now arriving from HD 202206 set out around 1876.
A wildly eccentric orbit — its distance from the star swings 2.5× between closest and farthest.
Its star is within reach of ordinary binoculars (V 8.1).
Orbit shapes and relative timing are true — worlds sweep faster near their star, as Kepler demands. Spacing is drawn to true scale when the system allows; wide systems open compressed so inner and outer worlds share the page. Dashed orbits are derived from period alone.
The measures
Earth
1.0 R⊕
HD 202206 b
12.1 R⊕
Jupiter
11.2 R⊕
Life outlook
Hostile
- Warmth
- 11 · weight 40%
- Size
- 0 · weight 30%
- Star
- 100 · weight 20%
- Orbit
- 5 · weight 10%
~315 K equilibrium vs Earth's 255 K
12.1 R⊕ vs Earth's 1.0 — larger worlds trend gaseous
5764 K vs the Sun's 5772 K
e = 0.426 vs Earth's 0.017 — swings mean climate whiplash
A strict Earth-similarity index, not a detection: every factor peaks at Earth's own value and they multiply, so one hostile factor sinks the score — only a true Earth twin would reach 100. Equilibrium temperature ignores atmospheres, which can warm a cold world into comfort, or turn a Venus into a furnace.
The world
- Class
- Gas Giant
- Radius
- 12.1 R⊕
- Mass
- 6,849 M⊕
- Density
- 21.2 g/cm³
- Equilibrium temperature
- 315 K
- Starlight received
- 1.66× Earth
The orbit
- Period
- 256.26 days
- Semi-major axis
- 0.81 AU
- Eccentricity
- 0.426
The star
- Host
- HD 202206
- Spectral type
- G2 V
- Temperature
- 5,764 K
- Radius
- 1.04 R☉
- Mass
- 1.06 M☉
The system
- Distance
- 150 ly · 46 pc
- Known planets
- 2
- Stars
- 1
- Coordinates
- RA 318.74° · Dec -20.79°
The observation
- Star brightness
- V 8.1 · binoculars
- Atmospheric spectra
- none yet
- Stellar age
- 3.9 Gyr
The record
- Method
- Radial Velocity
- Facility
- La Silla Observatory
- Discovery
- 2026
- Parameters published
- —
This world's keeper
TestNet
Consulting the chain…
Planetary industry
Survey assay
The same physics that paints this world prices its industry — radius, density, starlight, and the chance of life set these rates.
Helium-3³He
14.2/h
Silicate GlassSiO₄
5.7/h
Hold this world's deed to found an outpost and work these seams.